Attachment for drill



May 3, 1966 L. L. MEYER 3,248,973

ATTACHMENT FOR DRILL Filed Jan. 20, 1964 mit E i INVENTOR. ESTER L.MEYER BY www United States Patent O 3,248,973 A'ITACHMENT FOR DRILLLester L. Meyer, 120 W. George St., Arcanum, Ohio `Filed Jan. 20, 1964,Ser. No. 339,032

2 Claims. (Cl. 77-14) This invention relates to an attachment for aportable electric hand drill, the attachment being adapted for use inexerting pressure on the drill against the work, although the adaptationof the attachment is not necessarily limited to hand drills.

This invention is an improvement upon the disclosure in my Patent No.2,827,807, patented March 25, 1958.

An object of this invention is to provide an attachment wherein aflexible member is used as a ratchet for an attachment used in forcing adrill in an electric drill towards the work. This has been accomplishedby the use of a link chain as a ratchet bar in a tubular handle member,the chain being actuated by a pawl mechanism associated with the tubuarhandle member used in forcing the drill into the work to be drilled.

Other objects and advantages reside in the construction of parts, thecombination thereof, the method of manufacture and the rnode ofoperation, as will become more apparent from the following description.

In the drawings, FIGURE l is a side elevational view of a portableelectric drill provided with an attachment for exerting force againstthe drill into the work.

FIGURE 2 is a side elevational view of the attachment showing parts insection and broken away to disclose the operating mechanism.

FIGURE 3 is an enlarged view of an actuating pawl.

FIGURE 4 is an enlarged, perspective view of the arresting pawl.

FIGURE 5 is a perspective view of a locking member for locking theactuating lever against the side of the tubular handle.

FIGURE 6 is a fragmentary View of the pawl mechanism, the handle and theactuating lever, with parts broken away and in section.

Referring to the drawing in detail, FIGURE l illustrates a conventionalpistol type electric hand drill 10 to which the attachment which is thesubject matter of this invention is attached.

The attachment shown herein consists of a tubular member adapted to besubstituted for one of the usual handles used on electric hand drills.The tubular handle is provided with an enlarged head portion, providedwith a pair of oppositely disposed slots or openings, one on top ofanother below, as viewed in FIGURES 2 and 6. A roller or pulley isrotatably mounted in the lower opening and has a chain, such as abicycle chain, trained over it, so that one end extends into the tubularhandle and the other end projects outwardly at right angles to thehandle and in a direction parallel to the drill. A suitable attachingdevice is used in attaching the outer end of the chain to the work to bedrilled. The drill is forced against the work to be drilled by a leverand pawl mechanism, as will appear more fully in the following detaileddescription.

The attachment 12 comprises the tubular handle portion 14, an actuatinglever 16 and a chain 18. The chain 18 may be a bicycle type of chain,having longitudinally extending link members 20 pivotally attachedtogether by transverse bars 22. The chain 18 |may be selectively drawninto and released from the handle portion 14. The outer end of the chain18 is provided with a hook 24 adapted to engage suitable meanssurrounding or engaging the work 26 to be drilled. In FIGURE 1, a cable28 has been used for the purpose of illustration. Instead of a cable, achain like that disclosed in my Patent No.

3,248,973 Patented May 3, 1966 ice 2,827,807 may be used, or any othersuitable means for attaching the hook 24 to the work.

As best seen in FIGURES 2 and 6, the chain 18 passes over a roller orpulley 30 rotatably mounted upon a transverse pin 32 functioning as anaxle for the pulley 30, as a pivotal mounting for the bifurcated end 36of the lever 16 and passing through suitable apertures in the headlikeportion 38 integral with the tubular handle portion 14. The portion 18aof the chain 18 located in the tubular handle portion 14 extends atright angle to the portion 18h of the chain that normally extendsparallel to the drill. The intermediate portion 18e of the chain passesover the pulley 30. As clearly shown in FIGURE 2, the innermost link ofthe chain supports an arresting member 40 which may be a rivet havingthe ends upset and adapted to engage the shoulders 42 in the tubularhandle portion 14. This limits the outward movement of the chain.

An arresting pawl 50 is pivotally attached at 52 to the furcations 36 ofthe lever 16. A spring 54 is used to bias the chain engaging end of thepawl 50 into the position shown in FIGURE 2 and to bias the lever 16away from the handle 14. An arresting pawl 60 is pivotally mounted at 62to the enlarged head-like portion 38 of the tubular handle portion 14. Aspring 64 is used to bias the arresting pawl 60 into the position shownin FIGURE 2. As can best be seen in FIGURE 4, the pawl portion 60a isprovided with an inclined surface 60!) on the under side thereof, sothat as the lever 16 is actuated from the full line position shown inFIGURE 2 into the dot-dash position 16a, the pawl 60 actuates the chainto the left, as shown in FIGURES 2 and 6. The arresting pawl will bemoved upwardly out of engagement with the cross bar 22 and by the timethe lever 16 is in the dot-dash position 16a, the pawl 60 has droppedinto a succeeding opening in the chain, permitting the lever 16 to beactuated by the spring 54 from the dot-dash position 16a in FIGURE 2back into the full line position without the chain being retracted. Thelever 16 and the handle portion 14 may be conveniently grasped by ahand, so as to move the lever 16 towards the dot-dash position 16b andthe spring 54 actuating the lever back into the full line positioncyclically, to thereby continue forcing the rotating drill into andthrough the work piece. After the hole has been drilled, it is necessaryto release the chain 18 so that it may -be withdrawn. This isaccomplished by actuating the lever 16 into the dot-dash position 16hshown in FIGURE 6 and the full line position shown in FIGURE 6. The pawlS0 has a bight 70 formed between the furcations 72 and 74. This bightengages the upwardly directed prong 76 integral with the arresting pawl60 to raise the arresting pawl out of engagement with the chain 18, asclearly shown in FIG- URE 6, at which time the chain, of its own weight,may move to the right, as viewed in FIGURE 2, until the arresting member40 engages the shoulder 42. The drill may then be reset for drillinganother hole.

When not in use, a latch member 80, straddling the enlarged head portion38 of the tubular handle portion 14, may be moved from the full lineposition shown in FIGURE 1 to the dot-dash position shown in thisfigure, holding the handle in a dot-dash position 16a shown in FIGURE 1for convenience in carrying the drill from place to place or when thedrill is in storage` This attachment may be substituted for a handlenormally mounted opposite the handle of the drill. This handle isusually screwed into the housing of the electric motor driving thedrill. The attachment is secured into position in the threaded holevacated by the handle usually supplied by the manufacturer.

Although the preferred embodiment of the device has been described, itwill be understood that Within the purview of this invention variouschanges may be made in the form, details, proportion and arrangement ofparts, the combination thereof and mode of operation, which generallystated consist in a device capable of carrying out the objects setforth, as disclosed and defined in the appended claims.

Having thus described my invention, I claim:

1. An attachment for a portable hand drill having an electric motormounted in a motor housing including a tubular handle portion attachableto one side of the motor housing and adapted for use in holding the handdrill, said handle portion having an opening in the wall thereof andnear the motor housing, a link chain passing through the opening in thetubular handle portion, said link chain having transverse bars, theouter end of the chain extending along the side of the motor housing andparallel to and in the direction of the drill, the portion of the chainwithin the tubular handle portion extending substantially at a rightangle to the portion of the outer end of the chain, roller means forsupporting the portion of the chain connecting the outer portion thereofto the inner portion thereof, a lever pivotally attached to the handleportion and ratchet means engaging the transverse bars of the link chainto draw the chain step by step into the handle portion upon the leverbeing reciprocated, and means for connecting the chain to the work to bedrilled so that as the lever is actuated the drill is drawn toward thework,

2. An attachment a-ccording to claim 1, wherein the inner end of thechain is provided with a chain `arresting member engaging an abutment inthe handle portion to prevent withdrawal of the entire chain whenwithdrawing the chain from the tubular handle portion.

No references cited.

WILLIAM W. DYER, JR., Primary Examiner.

F. S. HUSAR, Assistant Examiner.

1. AN APPARATUS FOR A PORTABLE HAND DRILL HAVING AN ELECTRIC MOTORMOUNTED IN A MOTOR HOUSING INCLUDING A TUBULAR HANDLE PORTION ATTACHABLETO ONE SIDE OF THE MOTOR HOUSING AND ADAPTED FOR USE IN HOLDING THE HANDDRILL, SAID HANDLE PORTION HAVING AN OPENING IN THE WALL THEREOF ANDNEAR THE MOTOR HOUSING, A LINK CHAIN PASSING THROUGH THE OPENING IN THETUBULAR HANDLE PORTION, SAID LINK CHAIN HAVING TRANSVERSE BARS, THEOUTER END OF THE CHAIN EXTENDING ALONG THE SIDE OF THE MOTOR HOUSING ANDPARALLEL TO AND IN THE DIRECTION OF THE DRILL, THE PORTION OF THE CHAINWITHIN THE TUBULAR HANDLE PORTION EXTENDING SUBSTANTIALLY AT A RIGHTANGLE TO THE PORTION OF THE OUTER END OF THE CHAIN, ROLLER MEANS FORSUPPORTING THE PORTION OF THE CHAIN CONNECTING THE OUTER PORTION THEREOFTO THE INNER PORTION THEROF, A LEVER PIVOTALLY ATTACHED TO THE HANDLEPORTION AND RATCHED MEANS ENGAGIONG THE TRANSVERSE BARS OF THE LINKCHAIN TO DRAW THE CHAIN STEP BY STEP INTO THE HANDLE PORTION UPON THELEVER BEING RECIPROCATED, AND MEANS FOR CONNECTING THE CHAIN TO THE WORKTO BE DRILLED SO THAT AS THE LEVER IS ACTUATED THE DRILL IS DRAWN TOWARDTHE WORK.